Winding mechanism



Sept. 15,1925.

- E. N. WOOD WINDING MECHANISM 2 Sheets-She t 1 Original Filed June 28. 1922 a $1. rL Q! I. n

Sept. 15, 1925. 1,553,351

E. N. WOOD WINDING MECHANISM Original F1164 June as. 1922 2 Shuts-Sheet, 2

@ 2 IL/2 y Patented Sept. 15, 1925. v

UNITED STATES I T 1,553,351 PATENTOFFICE- snwann n. woon, or CHICAGO, minnows.

wmnme mnormnrsm.

Original application filed June 28, 1322, Serial No. 571,451. Divided and this application filed December 3, 1923. Serial-No. 678,211.

To all whom it may concern:

Be it known that I, EDWARD N. WOOD, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Winding Mechanism, of which .the following is a full, clear, concise, and exact description.

invention relates to'gearing and is of particular-service when employed as a part of the winding mechanism used for operating the brakes upon freight cars, though the invention is not to be limited to any particular use to which it may be put, the present application being a dlvision of m original application Serial No. 571,451, filed June 28, 1922.

Vindin "mechanism embracing my invention inclu es a drum, a worm wheelin driving relation to the drum, a worm in mesh with the worm wheel, an operating shaft carrying the worm, an oscillatable cam block for separating the worm wheel and worm and having acam slot inclined to the plane of the worm wheel and through which slot said shaft passes, and means for preventing operation of the cam block by theworm shaft.

In the preferred embodiment of the invention I employ a detent beneath and normally in holding relation to the cam block, said block being mounted to ride upon said detent as a fulcrum when the block is in the] initial part of its gear unmeshing turning movement and in escaping relation to said detent in the ensuing part of its turning movement.

The invention will be more fully explained by reference to the accompanying drawings in which Fig. 1 is a view of a portion of the end of a freight car with the brake applyin mechanism constructed in accordance wit the preferred embodiment of my invention: Fig. 2 is a sectional view on line 2+2 of Fig. 1; Fig. '3 is a sectional view on line 33 of Fig. 2; Fig. 4 is a view on alarger scale of a part of the mechanismas it appears in Fig. 1; Fig. 5 is a sectional view on line 55 of Fig. 4; Fig. 6 is a view in side elevation, partially in section, of the winding drum of my invention and the gear in driving relation thereto; Fig. 7 is a view on line.77 of Fig. 6; Fig. 8 is a longitudinal sectional view of the drum .ppearing in Fig. 6; Fig. 9 is a side acters of reference throughout the different figures.

The winding mechanism of my invention has been embodied in the braking mechanism of a freight car, though, as stated, the invention is not to be thus limited.

The freight car 1 illustrated carries a stirrup 2 beneath it and has a strap bearing 3 near its upper end, these elements 2 and 2} serving to support the mechanism of the invention. A shaft 4 supports the winding dru 5 that turns upon this shaft which is carried by the sides ofthe stirrup 2. There is a drum actuating worm gear wheel 6 upon the same shaft 4 with the drum. The gear wheel, as well as the drum, turns upon and with reference to the shaft 4. The hub portion 7 of the gear wheel enters, or is in telescoping engagement with the hub portion 8 of the drum, the gear hub thus serving to support one end of the drum upon the shaft 4. The drum and gearare formed with intermeshing teeth 9 and 10 whereby the gear is. brou ht into driving relation with the drum. 1% worm 11 is in mesh with the worm wheel, this worm being carried upon an operating shaft 12. This shaft passes through the strapbearing 3 near its upper end and carries a supporting washer 13 at its lower end which slides upon the top surface of the stirrup bottom. The shaft carries a pin 14 which underlies the stirrup bottom. The lower end of the shaft passes through a slot 15 in the stirrup bottom to permit the worm to be moved out of mesh with the worm wheel, as will more fully appear. The shaft also passes through a cam slot 16 formed in a cam block 17 which is mounted to oscillate upon a rod 18 that passes through the ears 19, 20 that are carried by the stirrup 2. The cam slot isinclined to the plane of the worm wheel so that when the cam block is turned in a gear releasing direction, the shaft 12 will be forced to the outer end of the cam slot, carrying with it the worm that is thereby unmeshed from the worm wheel. This operationof the cam block is effected for the purpose of releasing the cable 21 after it has been wound upon the drum.

The block, for the cable releasing purpose, may be provided with a handle 22. 6 This handle is .within reach of the brake man upon the ground who reaches in between the cars to lift the handle to separate the gearing in order to release the brake which was previously applied by winding 10 the cable upon the drum.

'ing nearly to the roof of the car, may be connected with the handle in order that the handle may be lifted at the roof of the car to swing the cam block to a brake releasing 16 position.

It will beapparent that when the shaft' 12 is turned in a cable unwinding direction to relieve the brake there is a tendency for this shaft to ride upon one of the sloping walls of the cam slot and thereby effect disengagement of the worm 11 from the wormwheel 6. I provide means for preventing such a result from being consequent upon the cable unwinding rotation of said shaft. In the preferred embodiment of the invention,a detent 24. is employed for the purpose. This detentis carried by the stirrup 2, being preferably integrally formed as a lug in the same casting with the ears 19 and 20. As illustrated, this lug is beneath one side of the cam block and this cam block side is formed with anotch 25 that normally receives this lug normally to hold, the cam block in a non-gearing separating position.

4 of the cam block to rise since the detentis upon one side of the rod 18. After the han-' dle has been raised a predetermined extent the cam block escapes the detent as the cam block completes the final portion of its gear separating movement. When the gears have been separated the drum will be released to permit the cable to unwind. When the cam block is turned to its normal position the cam portion at 16 will return the shaft 12 from the outer end of the cam slot to the inner end thereof and thereby restore .the engagement of the worm with the worm wheel preparatory to the next brake apply- .ing operation of the shaft 12. The extent to which the drum may be turned in the break releasing direction is desirably 1i nited by a lug 27 upon the drum and a lug 28 upon the stirrup that is in the path of the lug 27.

The drum has two cable engaging portions, one an arcuate portion 29 and the other a cylindrical portion 30 within the circle of the arcuate portion and co-axial therewith. The trailing end 31 of the arcuate portion and the leading end 32 of the A rod 23, extend-.

When the handle 22 is turned to separate innercylindrical portion 30 are spaced apart circumferentially of the drum as indicated by the dot and dash lines in Figs. 7 and 11, the leading end 32 of the inner cable engaging portion trailing behind the trailing end 31 of the outer cable engaging portion. A flange joins both cable engaging portions 29 and 30 and is inclined in a. winding direction. The cable has an anchoring bolt 34 which is placed in a selected one of the openings 35, the anchoring bolt being placed in that one of the openings 35, which will cause as much spare slack as possible to be taken up. It will be obvious that when the drum is turned in a cable turning direction the outer arcuate cable engaging portion 29 will rapidly take up the slack that exists in the cable between the drum and the brake. When this slack has been about taken up the leading end 32 of the inner cable engaging portion will have reached the cable whereafter the cable will be wound at a re duced speed upon the drum to apply the brake with more power than if the cable were continuing to be wound upon a winding surface that had the curvature of the thereafter be more slowly wound in order to operate its load withincreased power.

While I have herein shown and'particula'rly described the preferred embodiment of my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without departing from the spirit of my invention, but Having thus described my invention I claim as new and desire to secure by Letters Patent the following 1. Motion transmitting mechanism including a worm wheel; a worm in mesh with the worm wheel; an operating shaft carrying the worm; an oscillatable cam block for separating the worm wheel and worm and having a cam slot inclined to the plane of the worm wheel and through which slot said shaft passes; and a detent beneath and normally in holding relation to the ram block, said block being mounted to ride upon said detent as a fulcrum when the block is; in the initialpart of its gear unincshing turning movement and in esraping relation to said detent in the ensuing part of its turning movement.

2. Motion transmitting mechanism including a worm wheel; 'a worm in-mesh with the worm wheel; an operating shaft carrying the worm; an osrillatable cam block for separating the worm wheel and worm and having a cam slot inclined to the plane of the worm wheel and through which slot said shaft passes; and a detent beneath and normally in holding relation to the cam block, said block being mounted to ride upon said detent as a fulcrum.

3. Motion transmitting mechanism including a worm wheel; a worm in mesh with the Worm wheel; an operating shaft carrying the worm; an oscillatable cam block for separating the worm wheel and worm and having a cam slot inclined to the plane of the worm wheel and through shaft passes; and a detent normally in holding relation to the cam block.

4. Motion transmitting mechanism inwhich slot said eluding a worm wheel; a worm in mesh with the worm wheel; an operating shaft carrying the worm; an oscillatable cam block for separatingthe worm wheel and worm and having a cam slot inclined to the plane of the worm wheel and through which slot said shaft passes; and means for pre venting operation of the cam block by the worm shaft. a v

In witness whereof, I hereunto subscribe my name this 31st day of October A. D.

192 EDWARD N. WOOD. 

